Engine control system

• US 8,924,127 B2
• Filed: 03/10/2008
• Issued: 12/30/2014
• Est. Priority Date: 03/10/2008
• Status: Active Grant

• Current Assignee: Deere & Company
• Original Assignee: Deere & Company
• Inventors: Cadman, Kristen D., Steenbergen, Elizabeth H., Fleischmann, Steve G., Reiter, Dennis P
• Primary Examiner(s): Kwon, John
• Application Number:
  US12/866,343
• Publication Number:
  US 20110184627A1
• Time in Patent Office: 2,486 Days
• Field of Search: 701/103, 701/114, 701/115, 123/336, 123/339.1, 123/339.19
• US Class Current: 701/103
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 2200/0404 Throttle position
• CPC Class Codes: F02D 2250/26 by applying a torque limit

Abstract

A ground engaging vehicle including a frame, an engine, a controller, an accelerator, a position sensor and an interpreter. The engine is supported by the frame and the engine includes a throttle. The controller is in communication with the engine. The position sensor is associated with the accelerator. The position sensor generates a first signal corresponding to a position of the accelerator. The interpreter receives the first signal from the position sensor and generates a second signal dependent upon the first signal. The interpreter communicates the second signal to the controller.

Claims

1. A ground engaging vehicle, comprising:

a frame;

an engine supported by said frame, said engine operable at a rotational speed, said engine including a throttle;

a controller in communication with said engine;

an accelerator;

a position sensor associated with said accelerator, said position sensor generating a first signal corresponding to a position of said accelerator; and

an interpreter receiving said first signal from said position sensor, said interpreter generating a second signal dependent on said first signal from said position sensor, said interpreter detecting a change in said first signal from said position sensor and communicating said second signal to said controller, said second signal being said first signal modified to not exceed a predetermined rate of change of said engine speed.

2. The ground engaging vehicle of claim 1, wherein said interpreter generates said second signal by being additionally dependent upon a rate limiting algorithm.

3. The ground engaging vehicle of claim 2, wherein said rate limiting algorithm limits said second signal to approximate a maximum engine speed of said engine.

4. The ground engaging vehicle of claim 3, wherein said maximum engine speed approximates a response of said engine with no load thereon.

5. The ground engaging vehicle of claim 1, further comprising:

a throttle actuator connected to said throttle to position said throttle, said throttle actuator communicatively connected to said controller; and

a power control algorithm utilized by said controller to send a third signal to said throttle actuator, said interpreter being a rate limiting algorithm that generates said second signal dependant upon a rate limiting function.

6. The ground engaging vehicle of claim 5, wherein said rate limiting function approximates a maximum engine speed of said engine.

7. The ground engaging vehicle of claim 6, wherein said maximum speed function approximates a response of said engine with no load thereon.

8. The ground engaging vehicle of claim 5, wherein said rate limiting algorithm is contained within said controller.

9. The ground engaging vehicle of claim 8, wherein said second signal is in the form of data generated by said rate limiting algorithm that is used by said power control algorithm.

10. The ground engaging vehicle of claim 9, wherein said data is offset by a predetermined value from said rate limiting function.

21. The ground engaging vehicle of claim 1, wherein said controller uses said second signal to control said throttle.

11. An engine control system for a ground engaging vehicle, comprising:

an engine including a throttle, said engine operable at a rotational speed, said engine capable of changing speed at a predetermined rate;

a controller in communication with said engine;

an accelerator;

a position sensor associated with said accelerator, said position sensor generating a first signal corresponding to a position of said accelerator; and

an interpreter receiving said first signal from said position sensor, said interpreter decreasing said first signal from said position sensor to a second signal based on said predetermined rate of engine speed, said interpreter communicating said second signal to said controller.

12. The engine control system of claim 11, wherein said interpreter generates said second signal by being additionally dependent upon a rate limiting algorithm.

13. The engine control system of claim 12, wherein said rate limiting algorithm limits said second signal to approximate a maximum engine speed of said engine.

14. The engine control system of claim 13, wherein said maximum engine speed approximates a response of said engine with no load thereon.

15. The engine control system of claim 11, further comprising:

a throttle actuator connected to said throttle to position said throttle, said throttle actuator communicatively connected to said controller; and

a power control algorithm utilized by said controller to send a third signal to said throttle actuator, said interpreter being a rate limiting algorithm that generates said second signal dependant upon a rate limiting function.

16. The engine control system of claim 15, wherein said rate limiting function approximates a maximum engine speed of said engine.

17. The engine control system of claim 16, wherein said maximum engine speed approximates a response of said engine with no load thereon.

18. The engine control system of claim 15, wherein said rate limiting algorithm is contained within said controller.

19. The engine control system of claim 18, wherein said second signal is in the form of data generated by said rate limiting algorithm that is used by said power control algorithm.

20. The engine control system of claim 19, wherein said data is offset by a predetermined value from said rate limiting function.

22. A ground engaging vehicle, comprising:

a frame;

an engine supported by said frame, said engine capable of changing speed at a predetermined rate;

an accelerator that receives an input to change the engine speed at a desired rate;

an interpreter that performs the steps of;

receiving a desired throttle input signal based on the input to the accelerator; and

limiting the desired throttle input signal to an actual throttle input signal when the desired rate of engine speed from the accelerator exceeds the predetermined rate of engine speed from the engine; and

a throttle that controls the engine speed based on the actual throttle input signal.

23. The ground engaging vehicle of claim 22, wherein, based on the actual throttle input signal, the throttle changes the engine speed at the predetermined rate, which is slower than the desired rate.